High-grade sofa cushions should use high-elastic foam sponge with a density of 30 kg/m3 or more, and back cushions should use high-elastic foam sponge with a density of 25 kg/m3 or more. In order to improve the comfort of sitting and lying, some foams have been softened without reducing the density, and some have vertical springs in the cushions, so that the sofa has higher resilience and anti-aging performance. Under normal circumstances, it is best to dent the sofa cushion about 10 cm after the human body sits down.
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